Răspuns :
x/a=y/b=z/c=t/d=u/e=10
(x+y+z+t+u)/(a+b+c+d+e)=10
10²-(x+y+z+t+u)/(a+b+c+d+e)=
=100-10=90
x/a=y/b=z/c=t/d=u/e=10
10²- x+y+z+t+u/a+b+c+d+e=?=====>
(x+y+z+t+u)/(a+b+c+d+e) =10
===>10²-10=100-10=90
x/a=y/b=z/c=t/d=u/e=10
(x+y+z+t+u)/(a+b+c+d+e)=10
10²-(x+y+z+t+u)/(a+b+c+d+e)=
=100-10=90
x/a=y/b=z/c=t/d=u/e=10
10²- x+y+z+t+u/a+b+c+d+e=?=====>
(x+y+z+t+u)/(a+b+c+d+e) =10
===>10²-10=100-10=90